Malicious PDF — malware analysis report

Static analysis result for SHA-256 635f852a14b1ae69…

MALICIOUS

PDF

66.9 KB Created: 2021-03-30 12:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0681cf57d2bc5db4d8a92b98e11d04e6 SHA-1: dcf2d34088e62fe5c943cea0db776e5c461e71b2 SHA-256: 635f852a14b1ae6977cfa15f90fe06aaa2e6876d01080fe4955a9df012605897
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation scheme. ClamAV and ML classifiers identified the PDF as malicious, specifically flagging it as phishing-related. While no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/123?utm_term=jurnal+analgesik+issn+pdf PDF link annotation
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/limoko_peroravebonip.pdfIn PDF document text
    • https://kasababafaraw.weebly.com/uploads/1/3/5/3/135336348/2995984.pdfIn PDF document text
    • https://wejobufobugof.weebly.com/uploads/1/3/5/3/135348322/7074921.pdfIn PDF document text
    • https://bozaxemavokasum.weebly.com/uploads/1/3/1/3/131383719/30b86e66bb70f7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410952/normal_60249ebb57f62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371244/normal_5fc7f7e3291c2.pdfIn PDF document text
    • https://wukajimodowel.weebly.com/uploads/1/3/0/8/130874313/mobafeborebaju-tuvilokuvewevig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401697/normal_60227561e9ca0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450046/normal_5ffd1d2cecff6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448094/normal_5fd666605ecaa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ziwuvijevo/starbucks_chilled_coffee_drink_price_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/274efad7-6b2f-45b4-907b-c2e6f5ec28e2/zavakolawil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c76474f2-4ff3-4246-b388-e7afd9f5d05d/49621322901.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9006d0cc-f231-4ce6-89a3-4260eddc98fd/22926656590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd77f6a1-d432-41d0-850a-61835e03402d/what_does_amber_light_on_router_mean.pdfIn PDF document text
    • https://3f7ff619-1e23-491c-a925-ddda4d79b49c.filesusr.com/ugd/79c22a_5a143230e5834265a176096ae24c9fe3.pdf?index=trueIn PDF document text
    • https://044ec7df-721b-4788-b209-87474a3fcb06.filesusr.com/ugd/60ffa2_54b93d963a3d46988ebdc8bdd09b0045.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e300d945-ccbf-4563-9474-1c26f7355b4f/57662316572.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/intro_video_maker_pro_apk_mod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afc36218-7828-4975-8dcc-543b1f7c0e53/how_to_create_an_emp_jammer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f82379fc-e529-45c2-82c9-d76324517f0f/should_you_read_throne_of_glass_or_assassins_blade_first.pdfIn PDF document text
    • https://s3.amazonaws.com/wefemabeni/fundamentals_of_programming_using_java.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/mathematical_formulas_free_download.pdfIn PDF document text
    • https://a98f38e8-5810-4fc9-be6a-c3d78c7c4f9f.filesusr.com/ugd/921909_56d83a471aa749578431b9688233c2f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57f82f98-b75a-4a3e-8456-e53bf2c4e4c2/que_tipos_de_sistemas_dispersos_existen.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/percy_jackson_trials_of_apollo_set.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B7 5260 bytes
SHA-256: f19600053d56c766313f45785655bb4c54ab1254e085e254fdbc3c6d021aa166
font_01_sfnt_off0000dbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB2 10004 bytes
SHA-256: 1ad0c8350144ed4c864077682b2acd558b2dd0fc698e0fc76646d00a4f0c97f4

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